javascript - Jquery function to split option list into hierarchical select -

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i have list looks this:

<select>     <option value="all" selected="selected">- -</option>     <option value="16">africa</option>     <option value="17">asia</option>     <option value="56">-china</option>     <option value="57">-japan</option>     <option value="19">canada</option>     <option value="20">-alberta</option>     <option value="21">-british columbia</option>     <option value="22">-manitoba</option>     <option value="23">-new brunswick</option>     <option value="24">-newfoundland &amp; labrador</option>     <option value="25">-northwest territories</option>     <option value="26">-nova scotia</option>     <option value="27">-nunavut</option>     <option value="28">-ontario</option>     <option value="29">-prince edward island</option>     <option value="30">-quebec</option>     <option value="31">-saskatchewan</option>     <option value="32">-yukon</option>     <option value="33">central &amp; south america</option>     <option value="34">europe</option>     <option value="35">republic of ireland</option>     <option value="36">united arab emirates</option>     <option value="37">united kingdom</option>     <option value="38">-england</option>     <option value="39">-northern ireland</option>     <option value="40">-scotland</option>     <option value="41">-wales</option> </select>

i can't change html, need split select 2 selects jquery first show top level choices example if canada chosen show second drop down provinces. has dynamic underlying list might change time.

i understand easier if there optgroups unfortunately out of control. basicly need convert simple list hierarchical select in browser.

you can use below query split continents , countries select box.

note - put id="select" main select box.

$(function(){     var continent='';      $('#select option:gt(0)').each(function(){       var value = $(this).val();       //check if option text don't have '-' in it, take       // continent , create select box same id       if($(this).text().indexof("-")==-1 && continent!=value)       {         continent=value;           $('#select').after('<select id="'+continent+'" style="display:none" class="country"></select>');       }       else       {         //add option newly created select box               $('#'+continent).append($(this));       }       });      //remove country select box empty     $('.country').filter(function(){         return $(this).children().length ==0;     }).remove();      //bind change event select box show / hide country select box     $('#select').change(function(){        $('.country').hide();        $('#'+$(this).val()).show();     }); });

demo


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